Total natural gas rig count in the US (including conventional gas drilling) Shale gas is natural gas that is found trapped within shale formations. Shale gas has become an increasingly important source of natural gas in the United States since the start of this century, and interest has spread to potential gas shales in the rest of the world.
A stressor is a chemical or biological agent, environmental condition, external stimulus or an event that causes stress to an organism.[1]
We generally use the word stress when we feel that everything seems to have become too much-we are overloaded and wonder whether we really can cope with the pressures placed upon us. Anything that poses a challenge or a threat to our well-being is a stress.n this text we shall be focusing on stress that is bad for you. The difference between stress and a stressor - a stressor is an agent or stimulus that causes stress. Stress is the feeling we have when under pressure, while stressors are the things we respond to in our environment.